Question

How can u show that the colourless liquid given to u is pure water!?

Give atleast three tests..

Can filteration and evaporation be one of the methods???

Answer 1

1)By boiling the water we can check whether it is pure or not. If the water boils at 100 degree Celsius then it is pure but if its boiling point increases or decreases then the water must have some impurities and thus we can say that it is not pure.

2)By evaporating the colourless liquid on a low flame. If there is no residue left, then the colourless liquid is pure water.

3)Fractional distillation can also be used.On fracttional distillation the pure liquid will completely evaporate as it will have its characterestics boiling point and condense thus seperate.Nothing will be left in distillation flask.While if it is impure,the pure liquid will distill off and impure liquid will be left in the distillation flask.

Yes,evaporation can be used